(57) Apparatus and method for screening an image for half-tone reproduction by image reproduction
apparatus which includes a marking device, preferably a laser beam, which is operative
to mark a medium along a multiplicity of parallel marking lines. The method includes
the steps of providing a digital representation of density values of an original image,
determining whether to rotate dot shape information in accordance with the dot shape
symmetry and density, rotating dot shape information if the symmetry and density criteria
are met, storing said dot shape information in its rotated on non-rotated form, said
dot shape information representative of a screen function; and extracting said dot
shape information from storage for said density values in the form of information
that designates on and off points for each marking line. The apparatus includes means
for carrying the steps of the disclosed method.
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